Pull shovel



P. BURKE May 19, 1931.

FULL snov'nz.

Filed June 29, 1927 2 Sheets-Sheet l INVENTOR. @441 M ATTORNEYS May 19, 1931. p, BURKE 1,805,479

PULL SHOVEL Filed June 29, 1927 2 Sheets-Sheet 2 INVENTOR. Ewe {L42 'MQW ATTORNEY}? thrusting eiiect.

Patented May 1 9, 1931 AssIGNoa To noit'rnwns'r ENGINEEMNG 'oonrona'rron, A: connoaa'rroivor WISCONSIN};

PUL snovEL Application" filed June 29,

machines of the typein'which the shovel .or'

dipper is pulled toward themachine during digging, machines of this type being general- 1y employed for such work as, digging ditches;

Inmy prior United States Patent, No; 1,562,288, dated November 17 1925, I have shown in Fig.1 an excavating machine or pull shovel ofthetype above described in which the pull ordrag cable is guided along the boom at asmall or negligible distance above the boom hinge and this isthe reeving ordinarily used in machines ofthistype and the only force tending to push the dipper into the work-is gravity 'actingupon theweight of the boom, dipper and dipper stick. As the depth of the digging increasesgthe-lifting efiect of the drag cable upon the whole assembly becomes morerpronounced and as the depth increases a point is reached where additional crowding force is necessary to cause the apparatus to negotiatejhard digging, g A, i the-boomvertically pivotally attached at its successfully; This additional crowdingeifect may be attained by adding weight to the boom, dipper or dipper stick, this however, having the great disadvantage ,of requiring additional energy tohoist and alsoimposing a 7 more severe requirement upon the braking mechanism in order tolower the added weight back into the trench. To overcome these difiicultieswithout increasing weights I .have provided a; construction in which the power of the prime moveryi's' used to increase the thrusting effort and more particularly by reeving of the. drag-"cable at either its live or dead end, or both, so as to dispose said cable below the'hinge pin of the boom, with the result that the tension'ed drag cable creates adownward thrust on'the boom and hence on the dipper so that it'will negotiate hard digging successfully'and have further provided means for increasingthis The invention further consists in the several features hereinafter set forth and more particularly defined by claims at the conclusion hereof. w i v In the drawings Fig. l is an elevation View In'the drawing 1927. Serial No; 202,401.

omTED jSTATeSfPATENT "OFF-RICE v v PAUL BURKE, or GREEN BAY, wiseonsm of a machine embodying the invention, showingthe draglinereevedin'one way;

n Fig. 2 is ,a' detail plan view ofpart of the boom and the dragline arrangement shown in Fig. l; I

I Fig; 3 is a detail elevation view of the inner endof thevboom showing amodified form of reeving of the dragline;

Fig. 4is a detail plan view of the arrangementshowninFig. 3; r

Fig. 5 is a detail elevation view of the inner end of the, boom showing a modificatien of reeving of the dragline; a Fig. (Sis ajdetail plan view of the arrange ment -showniin Fig. 5. V 7 V full/side elevationview of the. machine is shown inFig. l andas the modifications hereinafter described: deal more particularly with the reeving of thedragline at the inner end of the boom; the complete machine has not been reproduced as the relation of the "parts will be clear from Fig. 1.

s the numeral 7 designates inner end to ahinge-pin 8 suitably mounted on theirot-ating base 9 of the machine, which base, is 0f well known construction and mounted on the travelling base 10 of the ma chine. A prime mover 11 is mounted on the base, 9 i and through suitable transmission mechanisms drives the propelling treads 12 and actuatesthe hoisting. drum 13 and the dragline drum 14. The drums '13 and 14 may be of any suitable construction equipped .with clutches and brakes to control their opbooni'at 17 and carries a pair of padlock sheaves :18 (one beingshown) at its upper end around which the hoisting cable 19 is wound, asmore-particularly shown and describedfin the aforementioned patent, said cable'also passing around a sheave 20 secured to an upright frame member 21 and having one end 22 dead-ended on the frame of the the hoisting drum the dipper and boom may be raised and lowered.

In Fig. 1 the dragline 24, instanced here as a two-part line, passes from the drum 14 under a sheave mounted on the rotating base adjacent one side of the boom andbeneath the hingespin 8, thence over sheaves 26 and 27 on said boom, down around a padlock sheave 28 associated with the dipper and thence over a sheave 29 and is dead-ended at 30 upon the boom. With this reeving there is a downward pulling or thrusting moment upon the boom equal to the tension in the drag cable 2-4 multiplied by the. perpendicular distance C between the line of action of said cable at sheave 25 and the center of the hinge-pin 8. Thus, when the boom 7 and dipper 15 have been lowered into digging position, as shown in Fig. 1, and the hoist cable 19 is being payed out as the drag cable is being pulled in the tension of said drag cable will act to pull the boom downwardly and hence increase the crowding effect on the dipper, during digging, over the weight of the boom. dipper and dipper stick or handle. Thus,in this instance, disposing the live end of the drag cable 24. below the boom hinge produces thedesired effect.

The'same effect may be had by displacing the dead end of the drag cable below't-he boom hinge, as shown in Figs. 3 and 4 wherein the live end 31 of the dragline passes from the drum 14 under a pulley 32 above the boom hinge 8 and thenceover the sheaves 26 and 27, as in the first-described arrangement, around the padlock 28, and the dead end portion 33 of said dragline passes over the sheave 29, journalled on the same shaft as that for the sheave 2,7, and sheave, 34,;fournalled on the same shaft as that of sheave 26, thence downwardly over a sheave 35 on the boom which, during digging, is below the hinge-pin of the boom, and is dead-ended at 36 on the base 9 of the machine.

An increased digging effect over these described may be had by displacingboth the live and dead ends of the drag cablebelow the boom hinge by a combination of the arrangements shown in Figs/1 and 3, wherein the live end of the dragline passes from the drum 14 over the sheave 25and thence over sheaves 26 and 27 to the padlock 28, as shown in Fig. 1, and the dead end portion returns by way of sheaves 29, 34, 35 to the dead end 36, as shown in Fig. 3. This arrangement has not been shown in detail as it is generally similar to that shown in Figs. 4 and 5 which further increases. the thrusting effect by running the dead end portion 37 of the dragline over a pulley or sheave 38, mounted on arms 39 secured to the base 9, and dead-ending it at 40 on the boom. This sheave arrangeadjacent its pivot to Aside from the reeving above described, whereby the thrusting effect on the dipper during digging is increased, the general operation of the machine is similar to that of my prior patent, it being noted that the action of the dipper is governed by the manipulationof the hoist and draglines and that after the dipper receives its load the boom is hoisted until the dipper clears the bank and then by swinging the boom, by the turning of the base 15, the dipper is moved to its discharge position at which time the dragline 2-1 is released or paid out and the weight of the dipper and its contents then swings the dipper outwardly to discharge the load.

Inasmuch as the effectiveness of the drag cable tension to produce the downward crowding cflort is proportional to the perpendicular distance between the line of action of the cable and the center of the hinge-pin, an adjustment of this effort may be readily effected by adjusting the placement of the sheaves, such as sheaves 25' or 35, used in guiding the drag cable in the vicinity of the boom hingepin, such adjustment obviously providing for the shifting of the shafts for said sheaves on their support, in any suitable manner.

I desire it to be understood that this inventi'en isnot to-be limited to any particular form or arrangement of parts except insoiar assuch limitations are included in the claims or necessitated by the prior art. I

'What'I claim as my invention is:

1, In an excavating machine of thetype described, the combination with a support, of a boom pivoted thereon, a dipper and dipper handle pivotally carried by the boom and movable'toward said support during digging, ahoisti ng cable associated with the dipper and boom, and a dragline associated with the dipper and means for guiding said dragline along the boom and beneath the same reeved to produce a downward pull on the boom produce a thrusting cffort on the dipper.

'2. In an excavating machine of the type described, the combination with a support, of a boom pivoted thereon, a dipper and dipper handle pivotally carried by the boom and movable toward said support during digging,

a hoisting cable associated with the dipper and boom, and a dragline associated with the dipper and having a portion in thrusting engagement with the boom and having a porthan working, during diggin in a plane beneath the boom pivot to produce, with said first named portion, a thrusting effort on the dipper.

3. In an excavating machine of the type described, the combination with a support, of a boom pivoted thereon, a dipper and dipper handle pivotally carried by the boom and movable toward said support during digging, a hoisting cable associated with the dipper and boom, and a multi-part draglineassocidigging.

sociated with the dipper and boom and having its live and dead end portions reeved to work, during digging, in a plane beneath the boom pivot to produce, with the parts associated with the boom, a thrusting effort on the dipper.

5. described, the combination with a support, of a boom pivoted thereon, a dipper and'dip per handle pivotally carried by the boom and movable toward said support during digging, a hoisting cable associated with the dipper and boom, a'multi-part dragline as-* In an excavating machine of, the type a hoisting cable associated with the dipper and boom, and a dragline associated with the dipper, dragline guide means on said boom intermediate its ends, and dragline guide means todispose a portion of said cable in a plane beneath the boom adjacent its pivot V and cooperating with said first-named guide means'to produce a thrusting efiort on said boom and dipper during di ging. v

In testimony whereof, I a my signature.

' PAUL BURKE.

sociated with the dipper and boom and hav- I ing one of its parts working, during digging, in a plane beneath the boom pivot to produce, with the parts associated with the'boom,"a thrusting effort on the dipper, and means associated with said part of said line to increase its thrusting efiort. V

6. In an excavating machine of the type described. the combination with a support. of a boom. pivoted thereon. a dipperand dipper handle pivotally carried by the boom and movable toward said support during digging. a hoisting cable associated withthe dipper and boom. a dragline drum on said support, a sheave on the intermediateportion of the boom. a dragline passing from said drum and over said sheave and associated with said dipper, and dragline guide means for depressing a part of said dragline between said drum and sheave to a position below the boom pivot to produce a thrusting eflort on said boom and dipper during a boom pivoted thereon. a dipper and dipper handle pivotallv carried bythe boom and movable toward said support during jdigging, a hoisting cable associated with the dipper and boom. a dragline associated with the dipper and boom and dead-ended at' a point adjacent and below the boom pivot to produce, with the part associated with the boom. a thrusting effort on the dipper during digging. j

8. In an excavating machine of the type 7 In an excavating machine of the type de' scribed, the combination with a support, of

described. the combination with a support, of

a boom pivoted thereon, a dipper and dipper handle pivotally carried by the boom and movable toward said support during digging, 

